Nighttime Lane Closures on Southbound I-25 Planned for Several Weeks

September 4 2015 - Denver Metro CDOT Region 1 - Closures Needed for Realignment of I-25 under Speer Boulevard and 23rd Avenue

DENVER – The Colorado Department of Transportation (CDOT) will begin multiple nightly lane closures starting next week on I-25 between Colfax Avenue and 20th Street for realignment of I-25 to accommodate repairs on the Speer Boulevard and 23rd Avenue bridges over I-25.

The restrictions, starting Tuesday, Sept. 9, from 7 p.m. to 5:00 a.m., will include single, double and triple lane closures. Single lane closures will begin at 7 p.m., double lane closures will begin at 10 p.m., and triple lane closures will begin at 11 p.m., with one lane of traffic remaining open at all times. Speeds will remain at 55 mph, however motorists should allow additional time for travel in the area and expect delays. A signed detour will be provided for the closure of 23rd Avenue exit ramp to Colfax Avenue. Intermittent nightly closures are expected to continue Sundays through Thursdays for approximately four weeks.

“I-25 is one of our busiest highways, and we know lane restrictions can cause impacts to drivers,” said Paul Jesaitis, CDOT Region 1 Transportation Director. “However, this work is critical for safety and maintaining our bridges, and we will do all we can to get the lanes open as quickly as possible.”

Completion of the realignment of I-25 will provide better clearance under the arch bridge girders on southbound I-25 and ultimately expand the Speer Boulevard and 23rd Avenue bridge lifespan resulting in improved safety along the I-25 corridor.

For more information on this project, please call the project hotline at 303-404-7042 or For real-time traffic alerts, visit or download the CDOT mobile app.